✓ Two crowns ✓ Same mass, different density ✓ Vertical slider ✓ Slider works ✓ Slider controls crowns ✓ Slider direction correct ✓ Full slider range — Fall animation ✓ Water displacement ✓ Rising water level ✓ Splash effects ✓ Physics correct ✓ Live mass value ✓ Live volume value ✓ Live density value ✓ Live displaced water ✓ Gilded displaces more ✓ Heureka animation ✓ No external deps ✓ Light bg / dark text ✓ Self-contained HTML
Solid ASCII-art implementation with correct physics (gold 19.3 g/cm³, alloy 13.0 g/cm³, same mass, alloy displaces more), functional vertical slider with correct direction and rising water levels, but no actual fall animation (crowns teleport via slider), splash effects are minimal single-row characters, and mass/volume/density values are static rather than dynamically updating.
Solid ASCII-art implementation with correct physics (gold 19.3 g/cm³, alloy 13.0 g/cm³, same mass, alloy displaces more), functional vertical slider with correct direction and rising water levels, but no actual fall animation (crowns teleport via slider), splash effects are minimal single-row characters, and mass/volume/density values are static rather than dynamically updating.